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Thu, 11 Jun 2026 13:17:34 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 296001] hwpmc: panic: [amd,526] pmc6,cpu15: Starting active PMC "K8-L3-0" Date: Thu, 11 Jun 2026 13:17:34 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 16.0-CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: asomers@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Bug reports List-Archive: https://lists.freebsd.org/archives/freebsd-bugs List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-bugs@FreeBSD.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D296001 Bug ID: 296001 Summary: hwpmc: panic: [amd,526] pmc6,cpu15: Starting active PMC "K8-L3-0" Product: Base System Version: 16.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org I get this cryptic panic whenever I try to start hwpmc to measure l3_misses= on my AMD Ryzen system. I can instantly reproduce it. Environment =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D FreeBSD 16.0-CURRENT at c289291a673 (main branch as of 9-June-2026) AMD Ryzen 9 5950X 16-Core Processor Steps to Reproduce =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D sudo kldload hwpmc sudo -E pmcstat -P l3_misses -d -O /tmp/cache_misses.log cargo build Stack Trace =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D #0 __curthread () at /usr/home/somers/src/freebsd.org/src/main/sys/amd64/include/pcpu_aux.h:57 #1 doadump (textdump=3Dtextdump@entry=3D0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_shutdown.c:3= 99 #2 0xffffffff804c665a in db_dump (dummy=3D, dummy2=3D, dummy3=3D, dummy4=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_command.c:596 #3 0xffffffff804c650a in db_command (last_cmdp=3D, cmd_table=3D, dopager=3Dtrue) at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_command.c:508 #4 0xffffffff804c612d in db_command_loop () at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_command.c:555 #5 0xffffffff804c9d60 in db_trap (type=3D, code=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_main.c:267 #6 0xffffffff80c5ba2f in kdb_trap (type=3Dtype@entry=3D3, code=3Dcode@entr= y=3D0, tf=3Dtf@entry=3D0xfffffe0165dcc6b0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_kdb.c:790 #7 0xffffffff8118e3c8 in trap (frame=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/amd64/amd64/trap.c:697 #8 #9 kdb_enter (why=3D, msg=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_kdb.c:556 #10 0xffffffff80c05be9 in vpanic (fmt=3D, ap=3Dap@entry=3D0xfffffe0165dcc8e0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_shutdown.c:9= 62 #11 0xffffffff80c05a63 in panic ( fmt=3D0xffffffff81da2270 "8\020(\201\377\377\377\377") at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_shutdown.c:8= 87 #12 0xffffffff83866802 in amd_start_pmc (cpu=3D15, ri=3D6, pm=3D0xfffff8000= d3da300) at /usr/home/somers/src/freebsd.org/src/main/sys/dev/hwpmc/hwpmc_amd.c:= 525 #13 0xffffffff8385c059 in pmc_process_csw_in (td=3D0xfffff80031581780) at /usr/home/somers/src/freebsd.org/src/main/sys/dev/hwpmc/hwpmc_mod.c:= 1585 #14 pmc_hook_handler (td=3D0xfffff80031581780, function=3D, arg=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/dev/hwpmc/hwpmc_mod.c:= 2171 #15 0xffffffff80c3e039 in sched_ule_sswitch (td=3D0xfffff80031581780, flags=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/sched_ule.c:2415 #16 0xffffffff80c12f82 in mi_switch (flags=3Dflags@entry=3D259) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_synch.c:526 #17 0xffffffff80c6f049 in sleepq_switch (wchan=3Dwchan@entry=3D0xfffff80034= b4e780, pri=3Dpri@entry=3D0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_sleepqueue.c= :608 #18 0xffffffff80c6f426 in sleepq_catch_signals (wchan=3D0xfffff80034b4e780, pri=3D0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_sleepqueue.c= :523 #19 0xffffffff80c6f179 in sleepq_wait_sig ( wchan=3D0xffffffff81da2270 , pri=3D1708967472) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_sleepqueue.c= :671 #20 0xffffffff80c12497 in _sleep (ident=3Dident@entry=3D0xfffff80034b4e780, lock=3Dlock@entry=3D0xffffffff81de9740 , priority=3Dpriority@entry=3D768, wmesg=3Dwmesg@entry=3D0xffffffff8131b9be "urdlck", sbt=3Dsbt@entry=3D0, pr=3Dpr@entry=3D0, flags=3D0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_synch.c:220 #21 0xffffffff80c28952 in umtxq_sleep (uq=3Duq@entry=3D0xfffff80034b4e780, wmesg=3D0xffffffff8131b9be "urdlck", timo=3Dtimo@entry=3D0x0) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:843 #22 0xffffffff80c3288a in do_rw_rdlock (td=3D0xfffff80031581780, rwlock=3D0x33d86e023b00, fflag=3D, timeout=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:3217 #23 0xffffffff80c2ae79 in kern__umtx_op (td=3D0xffffffff81da2270 , obj=3D, val=3D18, uaddr1=3D0x0, uaddr2=3D, ops=3D0xffffffff813b3e80, op=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:4994 #24 sys__umtx_op (td=3D0xffffffff81da2270 , uap=3D) at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:5019 #25 0xffffffff8118f269 in syscallenter (td=3D0xfffff80031581780) at /usr/home/somers/src/freebsd.org/src/main/sys/amd64/amd64/../../kern/subr_s= yscall.c:193 #26 amd64_syscall (td=3D0xfffff80031581780, traced=3D0) at /usr/home/somers/src/freebsd.org/src/main/sys/amd64/amd64/trap.c:1257 --=20 You are receiving this mail because: You are the assignee for the bug.=